The audio on my MacBook Pro won't work.

I just finished updating my MacBook Pro to Snow Leopard 10.6.8 and now the audio doesn't work. When I went to system prefrences and looked at Sound, I checked the Sound Effect Alerts and the audio there works, so I gather it's not an issue with the speakers themselves. But when I got to adjust the volume, play something on itunes, or acess pretty much any other source of sound, there is no audio. I ran updates on my computer and restarted it to see if this would solve the issue, but no luck.

I would try using a different set of headphones just to make sure that your headphones or their cord are not the problem. If it still doesn't work, it's time for a visit to the Apple Store to talk to the Genius about a repair.
Hope this helps

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The audio on my macbook pro cuts out after a few minutes.

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Apple store pronto. If need be (if less than 14 days from purchase) exchange for a new one!
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The sound on my macbook pro is not working

The sound on my macbook pro is not working. When I increase the sound, the icon appears as if everything is working, but no sound comes from the speakers. Earphones don't work either. I have tried a PRAM reset but at times, this doesn't even work. It's really frustrating having to restart my computer every time I want the sound to work, and even when I do that, theres a 50 50 chance of it working again. It generally happens after my laptop goes to sleep and I wake it up. Has anyone else had this problem and fixed it or even know what caused it?
There are a lot of discussions around the earphone jack but I have checked that. I've tried a PRAM reset which hasn't worked, and my sound output is set to Internal speakers.
HELP!!

Hopefully one of these steps should solve the problem.
1. System Preference > Sound > Output > Internal Speakers
    Highlight Internal Speakers / Headphones
    Make sure Mute is not enabled.
2. Remove the headphone.
    If you see red light in the headphone port, plug the headphone
    in and out of the port 5 or 6 times to flip the microswitch inside.
    Sound output may be stuck in the digital mode.
3. Reset SMC.     http://support.apple.com/kb/HT3964
    Choose the method for:
    "Resetting SMC on portables with a battery you should not remove on your own".
4. Applications > Utilities > Audio MIDI Setup
    Audio Devices window
    Side Bar
    Click the Built-in Output.
    Under Mute any of the boxes checked? If so, uncheck it.

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My DVD player on my MacBook Pro won't work! I can hear the sound of the video, but the actual image won't appear. Plus, I can't watch things on Youtube in full screen anymore because my computer won't show it. And finally, some of my images are very pixelated. I'm getting super frustrated that nothing will work. Please help me!
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Many times, these types of problems can be 'fixed' by using a commerical DVD 'cleaning' kit (usually available at local electronics stores, Amazon, etc.). If 'cleaning' doesn't work, you may have a faulty SuperDrive. But I would try the cleaning method first, beofre taking your machine into an Apple Store or AASP.
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The sound on my Macbook Pro does not work.

The sound on my Macbook Pro does not work. When we press the volume buttons, the sound icon pops up, but the bar is full with a small "Does not work" circle below it, and nothing happens when I hit volume up or done. I went into system preferences, but there aren't any options there that I can see to change it.

"Unfortunately, it doesn't provide any help for a MacBook Pro, other than indicating to call Apple Support" (sic).
Au contraire. TS1574's title and affected products are thusly:
"Troubleshooting issues with no audio from built-in speakers on Macs
Products Affected Mac mini, MacBook, MacBook Pro, iMac"
As a result, the instructions of the article are relevant. To be sure, follow those steps, the last of which is to contact Apple.
So, by way of reminder, here are the steps to troubleshoot the audio on your MacBook Pro. There is no red light, so the port is likely fine. Headphones work, so clearly your sound card is fine.
1. Ensure an incorrect version of OS X is not installed. If one is, then reinstall or erase/install after backing up your data.
2. Remove any external audio devices from USB, firewire, etc.
3. Open Sys Prefs > Sound > Output
If Internal Speakers is listed, select it and test again.
If Digital Out is listed, confirm again that all external audio devices and cables have been removed.
If mute is selected, unselect it.
If the volume slider is low, raise the volume.
If the above simply doesn't fix it, the issue may be a corrupted plist. Apple Support might be able to help troubleshoot the issue further, per the last step of TS1574.
I hope it gets resolved for you. Good luck.

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Don't use any cleaning spray. Wipe with a moist but not wet microfiber cloth.
1. Reset SMC.     http://support.apple.com/kb/HT3964
    Choose the method for:
    "Resetting SMC on portables with a battery you should not remove on your own"
2.Reset PRAM. http://support.apple.com/kb/PH4405

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The sound on my MacBook Pro is usually fine, but today it didn't work. For example, I tried listening to music on iTunes and watch videos but the volume wouldn't work at all. When I go to turn up the volume, it seems to turn up ok, but when I try to put on some music, it doesn't work at all. I then tried using my brother's Apple headphones on my MacBook Pro, and then the sound worked normally. I really would like this fixed so if someone could help me that would be great, because I don't want to keep using my brother's headphones just to watch a video or listen to music. Thank you to anyone who helps!

Hey
I did a NVRAM reset, and nothing happened. The sound stayed the same. Whats an audio output port, where can you find it, and where can you find the red light? When I try turning up the volume, instead of turning it up a cross sign appears under the speaker, thus no volume turns up. The menu bar right at the top of the screen - the speaker icon is not black, but more a very light grey.
Thanks for helping though!

The sound on my macbook pro does not work if I plug headphones in I can still hear but it will not project volume out loud and when I try to turn up the volume it is just greyed out what do I do ?

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Hopefully one of these steps should solve the problem.
1. System Preference > Sound > Output > Internal Speakers
    Highlight Internal Speakers
    Make sure that Mute is not enabled.
2. Remove the headphone.
    If you see red light in the headphone port, plug the headphone
    in and out of the port 5 or 6 times to flip the microswitch inside.
    Sound output may be stuck in the digital mode.
3. Reset PRAM. http://support.apple.com/kb/PH4405
4. Reset SMC.     http://support.apple.com/kb/HT3964
    Choose the method for:
    "Resetting SMC on portables with a battery you should not remove on your own".
5. Applications > Utilities > Audio MIDI Setup
    Audio Devices window
    Side Bar
    Click the Built-in Output.
    Under Mute any of the boxes checked? If so, uncheck it.
6. System Preferences > Sound> Sound Effects
    Play sound effects through:
   Select "Internal speakers" and then back to "Selected sound output device".

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Try performing an SMC reset:
http://support.apple.com/kb/HT3964
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Check System Preferences<Sound<Use Audio Port For.
I would recommend a MIDI to USB option if available though. Seems more reliable.

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the headphone out on the MBP doubles as an optical audio output as well. it is supposed to auto-detect when you have a digital optical cable inserted, so the sound output will switch automatically to digital. that's what the red light is - the optical audio data stream. what has happened is that your MBP has somehow gotten stuck thinking there's an optical cable plugged in. you can try plugging in and unplugging your headphones a few times to try and get it to un-stick. other people have said they've been able to do it very carefully with an unbent paperclip. but if none of this works you'll prob have to take it in for a service.
this is one of my gripes with the design of these machines. as an audio pro I'm very glad optical audio is built-in. but the fact that there is no option to select which output is used, or to disable the output entirely and just use the internal speakers, makes me nervous. I suppose it's supposed to be convenient that it auto-detects, but so many people come on this forum asking exactly the same question as you, it seems that it's really all too easy to accidentally jam it to the wrong setting. I'm really really careful when I plug or unplug anything from that port, because having it jam is the last thing I need. but I've already written to apple and asked them to change the sound control panel in OSX to allow us to choose exactly what the output is doing at all times, regardless of what's plugged in. I'd love to be able to leave my digital cable plugged in all the time, and just select to disable it so I can listen to the built-in speakers.. if only to lower the risk of damaging it by having to plug and unplug things all the time. same deal for when I use headphones. hopefully they'll sort it out because it really seems like it's far too easy to jam the switch in this port (same deal for the input port too) leaving people with no option but to get it repaired.

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Hi,
I purchased a MacBook Pro in Jan '11. Both the USB ports on the laptop were working fine. Recently, I have noticed, any external device connected to the USB port, towards the battery side does not recognize the connection.
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Anil,
Try resetting the SMC.
SMC RESET
Shut down the computer.
Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
Release all the keys and the power button at the same time.
Press the power button to turn on the computer.

HELP, the display of my macbook pro doesn't work.

The whole thing is like this. someday i just turned it on normally after i turned it off 2 days ago. and the thing happened.
i can hear the noisy form hard driver, SuperDrive , the startup tone and even after a while ,i could hear the "bo bo" when u press the sound-adjust key,F3 n F4. the keyboard worked fine but not the display.
it kept in black. not like the black screen in windows, it seemed like the display did not connect any power. meanwhile, the sleep light was on, in grey. so the whole thing is like the display system is in a sleep model but the other parts of the laptop are awake.
so i ve search some resolutions for similar problem. such like sleepimage , PRAM .but none of them is effective.
and i notes a new detail which could be different. when i rotate the lip, in some angle the sleep light would go bright white ,but in a right angle as it is when we work on it ,the sleep light get grey. if u keep on, almost 120,the max angle. it turned to be bright white again. and when i close the lip, originally, the light should be up and down like breathing. but now it keep solid bright-whitely, and the fans and hard disk sound like keep working .
it has been expired, so the apple care would be so expensive to solve some simple question.
does anyone know what happen to my Macbook pro? so that i could choice if i should send it to Applecare or not.
Thanx a lot

This morning I experienced exactly the same. So I immediately went to a Apple Premium Reseller this afternoon and handed over the MacBook. They told me this was their first case ever of this kind.
Anyway, it needs to be repaired, but before this they are going to run a test or two in order to get a precise indication. They also checked with the pram while I was in the shop. It might be the latest issue with the nvidia which concerns all the MacBook Pro's produced during spring 2007 until autumn 2007.
Lastly, I will give a call to Apple on Monday to discuss this matter because the Macbook is now fifteen months old. This Ferrari or Porsche of all Macs shouldn't behave like this.
By the way, I replaced my battery after 479 cycles last Wednesday for € 135. Still I don't think this has anything to do with this issue.
I keep you posted,
Mehdi

The audio on my MacBook Pro won't work.

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